Floor polishing machine



FIG. 1 is a front perspective view of a floor polishing machine showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear perspective view thereof; and

FIG. 4 is a bottom plan view thereof.

The electrical cord is shown broken away in FIGS. 1 and 3 for ease of illustration. 

The ornamental design for a floor polishing machine, as shown and described. 